Puerto Rico's net tax haul was $646.9 million in May, 14.1 percent below the same month last year, the U.S. territory's Treasury said on Friday, Reuters reported. The Treasury attributed the decline to one-time transactions last year. May's collections brought the fiscal year-to-date total to $7.98 billion, $44.7 million lower than the $8.03 billion of a year earlier and $314.7 million below the government's target.